Drop a saturation filter on itto shove it to gray-scale (saturation all the way down), then blurr it.
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Syncubus Yarr! Ye'll be walking Planck's Constant! [GMT-5],
Sat 7 May 2005, 4:14,
archived)
That works.Holding it on a different layer and mucking with opacity helps sometimes too (after desaturating it.)
Evil Prof. Pixel Masher I made this!,
Sat 7 May 2005, 4:49,
archived)